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Or option #4: are the Source's history books actually propagating a lie and Seeker clans acquired their clan names much earlier and/or for a much different reason, one that could have been feasibly mirrored by the Mystel on the First?
Dun dun DUNNNNN!
On your musing regarding the names of Warriors of Darkness it's important to note the Encyclopedia Eorzea posits these aren't their true names (he really isn't named Arbert, etc) and that they simply adopted the names to blend into Eorzean society.